What is the difference between delegated and application permissions in Microsoft Entra ID?

How delegated and application permissions differ in practice

Delegated permissions are tied to a signed-in user, so the app inherits that user’s identity and is constrained by the user’s own privileges. Application permissions are used when no user is present, so the app authenticates as itself and can act more independently. That distinction changes who is accountable, how consent is granted, and how carefully the permission set must be reviewed.

For microsoft entra id, the practical question is not just “can the app call the API?” but “under what authority will it call it?” Delegated access is usually the better fit for user-facing workflows, because the user context naturally limits what the app can do. Application permissions are better for background jobs, daemons, integrations, and automation that must run without user interaction.

The difference also affects consent and review. Delegated permissions often expose a narrower slice of the API surface because the signed-in user cannot exceed their own access, while application permissions can become tenant-wide if granted broadly. That is why app-only access needs stronger justification, tighter approval, and a clear inventory of which APIs and operations the app actually needs.

For consent and app registration hygiene, use the guidance in Entra ID Applications and Consent Guide to align permission choice with the app’s intended access pattern. The same guide is useful when you are deciding whether a requested scope belongs in user-consented delegated access or requires admin approval for app-only access.

Application permissions deserve particular caution because they can outlive the user session model that normally constrains delegated access. If the app’s credentials are exposed or the app is overconsented, an attacker can often use that app path directly without needing a user session. That is why permission choice and credential hygiene should be reviewed together, not separately.

Why application permissions usually require tighter governance

Application permissions are more powerful in most enterprise setups because they are not reduced by a user’s current role or session state. When an app can read mail, manage files, or modify directory data on its own, the blast radius depends on the permission grant itself, not on whether a user is actively present. The main governance concern is therefore over-authorization, not just misuse by a human caller.

That is also why admins should treat app permissions as a standing trust decision. Once granted, they can enable persistent access until the permission is revoked, the secret or certificate is rotated, or the app registration is removed. In practice, the risk is not only excessive scope but also weak ownership, stale app registrations, and forgotten service principals that continue to function long after the original business need has changed.

Microsoft identity hardening guidance and tenant review practices are useful here because delegated and app-only access often sit inside the same admin boundary. The difference is that delegated permissions can sometimes be constrained by user governance, while application permissions require direct control of the app identity itself. Active Directory and Entra ID Hardening Guide covers the broader access-control and hardening context that should frame that decision.

App-only access is especially sensitive when the app can reach high-value data or administrative APIs. If the app does not need to function unattended, delegated permissions usually provide a safer default because they preserve user-based limits and reduce the chance of silent, always-on access.

When to prefer delegated access, and when app-only is justified

Prefer delegated permissions when the action is clearly a user action, the user should be accountable for it, and the app does not need to continue operating after the user signs out. Examples include reading the signed-in user’s profile, accessing that user’s mailbox within their permissions, or working with data that is already bounded by the user’s own role.

Application permissions are justified when the workload must run unattended, such as scheduled sync jobs, security automation, background processing, or tenant-level integration tasks that cannot rely on an interactive login. In those cases, the app identity becomes the real security principal, so the app registration, secret or certificate, and consent record all need the same scrutiny you would apply to a privileged service account.

For application ownership, approval, and permission review, the Privileged Access Management Guide is a useful companion because the same least-privilege logic applies whether the caller is a person or an application. Where the app uses broad Graph scopes or directory-wide access, the review should be much stricter than for a user-scoped delegated flow.

When the app needs broad access, pair the permission grant with explicit ownership, periodic recertification, and a defined revocation path. If you cannot explain why the app needs app-only access, it usually belongs in delegated mode or should not be granted at all.

Risk and Threat Considerations

Application permissions create a larger attack surface because a compromised app credential can be used directly, often without the friction of a user session or interactive challenge. Delegated permissions are still risky, but the user context usually narrows what an attacker can do and limits abuse to the user’s own rights.

Failure mechanism: Overbroad app-only consent, combined with exposed secrets or weak app ownership, can turn a normal integration into a persistent tenant-level foothold.

Impact: Attackers may read data, modify directory objects, or automate abuse at scale until the app is disabled, the credential is rotated, or the grant is revoked.

Practitioner Guidance

What to verify: Confirm whether the app truly needs to run without a user, whether the requested Graph scopes match that function, and whether delegated access would satisfy the use case with less privilege. Review the app registration owner, credential type, and consent history before approving anything with broad access.

Decision rule: If the app can achieve the same business outcome with delegated permissions, choose delegated access. If app-only access is unavoidable, treat the grant as a privileged standing authorization and require a narrower scope, stronger change control, and a clear rollback path.

Practitioner takeaway: The most important judgement is whether the app is acting as a user or as its own principal, because that single choice determines the trust boundary, the consent model, and the blast radius of compromise.

Related resources from NHI Mgmt Group

• What is the difference between delegated permissions and application permissions in Microsoft Graph for mailbox access?
• What is the difference between Microsoft Identity Manager and Entra ID Governance for hybrid identity management?
• What is the difference between Microsoft Entra ID audit logs and sign-in logs for security monitoring?
• What is the difference between using on-premises Active Directory as the identity authority and using Microsoft Entra ID as the primary identity system?